| Official Name: | Magtar Lahjar |
| Native Name: | مكطع لحجار |
| Settlement Type: | Department |
| Pushpin Map: | Central African Republic |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: |  Mauritania |
| Unit Pref: | Imperial |
| Area Total Km2: | 13,829 |
| Population Total: | 57,672 |
| Population As Of: | 2013 census |
| Population Density Km2: | auto |
Magtar Lahjar is a department of Brakna Region in Mauritania.[1] [2]
The Magtar Lahjar department is made up of following municipalities:
In 2000, the entire population of the Magtar Lahjar Department has a total of 47 288 inhabitants (22 338 men and 24 950 women).